Re: [RFC PATCH 1/2] asm-generic: Remove pci.h copying code out to architectures

[Stafford Horne <shorne@gmail.com>]

On Thu, Jul 14, 2022 at 06:45:27PM -0700, Max Filippov wrote:
> On Thu, Jul 14, 2022 at 2:47 PM Stafford Horne <shorne@gmail.com> wrote:
> >
> > The generic pci.h header provides a definition of pci_get_legacy_ide_irq
> > which is used by architectures that use PC-style interrupt numbers.
> >
> > This patch removes the old pci.h in order to make room for a new
> > pci.h to be used by arm64, riscv, openrisc, etc.
> >
> > The existing code in pci.h is moved out to architectures.
> >
> > Suggested-by: Arnd Bergmann <arnd@arndb.de>
> > Link: https://lore.kernel.org/lkml/CAK8P3a0JmPeczfmMBE__vn=Jbvf=nkbpVaZCycyv40pZNCJJXQ@mail.gmail.com/
> > Signed-off-by: Stafford Horne <shorne@gmail.com>
> > ---
> >  arch/alpha/include/asm/pci.h   |  1 -
> >  arch/ia64/include/asm/pci.h    |  1 -
> >  arch/m68k/include/asm/pci.h    |  7 +++++--
> >  arch/powerpc/include/asm/pci.h |  1 -
> >  arch/s390/include/asm/pci.h    |  6 +++++-
> >  arch/sparc/include/asm/pci.h   |  5 ++++-
> >  arch/x86/include/asm/pci.h     |  6 ++++--
> >  arch/xtensa/include/asm/pci.h  |  6 ++++--
> >  include/asm-generic/pci.h      | 17 -----------------
> >  9 files changed, 22 insertions(+), 28 deletions(-)
> >  delete mode 100644 include/asm-generic/pci.h
> 
> [...]
> 
> > diff --git a/arch/xtensa/include/asm/pci.h b/arch/xtensa/include/asm/pci.h
> > index 8e2b48a268db..f57ede61f5db 100644
> > --- a/arch/xtensa/include/asm/pci.h
> > +++ b/arch/xtensa/include/asm/pci.h
> > @@ -43,7 +43,9 @@
> >  #define ARCH_GENERIC_PCI_MMAP_RESOURCE 1
> >  #define arch_can_pci_mmap_io()         1
> >
> > -/* Generic PCI */
> > -#include <asm-generic/pci.h>
> 
> Ok.
> 
> > +static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
> > +{
> > +       return channel ? 15 : 14;
> > +}
> 
> This addition does not make sense for the xtensa as it isn't even possible
> to enable PNP support (the only user of this function) on xtensa.

Thanks for your feedback, this is the kind of feedback I was hoping to fish out
with this patch.  I will look into completely removing this then.

-Stafford